Rep. Devin Nunes, R-Calif., attends a speech by President Donald Trump at the 2018 House and Senate Republican Member Conference at The Greenbrier, in White Sulphur Springs, W.Va., Thursday, Feb. 1, 2018. (AP Photo/Andrew Harnik)

WASHINGTON (AP) — Over the strong objections of his own Justice Department, President Donald Trump will clear the way for the publication of a classified memo on the Russia investigation that Republicans say shows improper use of surveillance by the FBI, White House officials said Thursday.

The memo, prepared by Republicans on the House intelligence committee, is said to allege FBI misconduct in the initial stages of its investigation of potential ties between Russia and Trump's 2016 campaign. Trump's Justice Department and Democrats furiously lobbied Trump to stop the release, saying it could harm national security and mislead the public.

A White House official said Congress would probably be informed of the decision Friday, adding Trump was "OK" with its release. A second White House official said Trump was likely to declassify the congressional memo but the precise method for making it public was still being figured out. The officials were not authorized to be quoted about private deliberations and spoke on condition of anonymity.

The FBI's stance means Trump, by allowing the memo's release, would be openly defying his own FBI director. It also suggests a clear willingness by FBI Director Christopher Wray, who in the early stretch of his tenure has been notably low-key, to challenge a president who just months ago fired his predecessor, James Comey.

Comey weighed in on Twitter Thursday night, writing, "All should appreciate the FBI speaking up. I wish more of our leaders would."

He advised his former colleagues at the FBI to "take heart: American history shows that, in the long run, weasels and liars never hold the field, so long as good people stand up."

The House intelligence panel voted along party lines Monday to put the memo out, giving Trump five days to reject the release under committee rules. But Trump also has the power to declassify the document himself and either release it or hand it to Congress to release. One of the White House officials said the memo would be in "Congress' hands" after Trump declassified it and there were unlikely to be any redactions to the document.

Trump has said he wants the memo released even after the FBI declared Wednesday that it has "grave concerns" about its accuracy. The document was written as part of an effort to reveal what Republicans say are surveillance abuses by the FBI and the Justice Department early in Russia investigation, before special counsel Robert Mueller was appointed to take it over.

Senior FBI officials have also made direct appeals to the White House, warning that it could set a dangerous precedent.

Democrats call the memo an attempt by Republicans to distract attention from the investigation into Russian meddling in the election that sent Trump to the White House. Democrats on the intelligence panel made a last-ditch effort Wednesday evening to stop the release, saying it had been "secretly altered" by the Republicans who wrote it.

Rep. Adam Schiff, D- Calif., ranking member of the House Intelligence Committee, arrives to speak at the University of Pennsylvania in Philadelphia, Thursday, Feb. 1, 2018. (AP Photo/Matt Rourke)

California Rep. Adam Schiff said in a letter to the House Intelligence Committee chairman, Republican Devin Nunes of California, that committee Democrats had discovered changes that were made after the vote Monday.

"The White House has therefore been reviewing a document since Monday night that the committee never approved for public release," Schiff said in the letter.

Schiff asked Nunes for another vote on the memo, but Republicans didn't appear to waver. Nunes spokesman Jack Langer said the committee vote was "procedurally sound."

"To suggest otherwise is a bizarre distraction from the abuses detailed in the memo, which the public will hopefully soon be able to read for themselves," Langer said.

This all comes as special counsel Mueller is investigating whether the Trump campaign improperly coordinated with Russia and whether Trump sought to obstruct the inquiry by, among other actions, firing Comey. Republicans have intensified their pressure on the Justice Department as Mueller's probe has moved closer to Trump's inner circle.

Trump has been telling confidants in recent days that he believes the document will validate his concerns that the FBI and Justice Department conspired against him, according to one outside adviser familiar with those conversations but not authorized to speak publicly about private discussions.

The president also has told allies that he believes the memo bolsters his claim that accusations of collusion between his campaign and Russian officials are false and part of a conspiracy to discredit his election.

Ryan charged that the Democrats were just out for political gain, saying the purpose of the memo is to reveal whether there have been abuses of surveillance laws.

President Donald Trump, accompanied by from left, Senate Majority Leader Mitch McConnell of Ky., House Speaker Paul Ryan of Wis., House Majority Leader Kevin McCarthy of Calif., and House Majority Whip Steve Scalise, R-La., speaks at the 2018 House and Senate Republican Member Conference at The Greenbrier, in White Sulphur Springs, W.Va., Thursday, Feb. 1, 2018. (AP Photo/Andrew Harnik)

"This memo is not an indictment of the FBI or the Department of Justice, it does not impugn the Mueller investigation or the deputy attorney general," he said, referring to Rod Rosenstein, who appointed Mueller in May.

But Schiff said the opposite Thursday, asserting that Trump is looking for a reason to fire Mueller and Rosenstein. He said he's more worried about Rosenstein because he decides the scope of Mueller's investigation.

"The White House knows it would face a firestorm if it fired Bob Mueller," Schiff said. "What's more effective is to fire Bob Mueller's boss."

Some Senate Republicans have also urged caution. South Dakota Sen. John Thune, the No. 3 Senate Republican, said the Senate intelligence committee hasn't seen the memo but should before it comes out. He also urged the House committee to listen to the Justice Department, saying they need to pay attemtion to "what our folks who protect us have to say" about the effects on national security.

Republican Sen. Jeff Flake of Arizona also questioned the release in a joint statement with Democratic Sen. Chris Coons of Delaware.